/Engine/Source/Runtime/Core/Public/Internationalization/TextLocalizationResource.h
Optimized representation of a case-sensitive string, as used by localization keys. This references an entry within a internal table to avoid memory duplication, as well as offering optimized comparison and hashing performance.
void AddEntry ( const [FTextKey](API\Runtime\Core\Internationalization\FTextKey) & InNamespace, const [FTextKey](API\Runtime\Core\Internationalization\FTextKey) & InKey, const [FString](API\Runtime\Core\Containers\FString) & InSourceString, const FTextConstDisplayStringRef & InLocalizedString, const int32 InPriority, const [FTextKey](API\Runtime\Core\Internationalization\FTextKey) & InLocResID )